Lock-guard for incandescent lamps ansd sockets.



H. HUBBELL. LOOK GUARD FOR INGANDESGENT LAMPS AND SOCKETS.

APPLICATION FILED DEG. 13, 1909.

Patented Apr. 12, 1910.

INVENTOI? WITNESSE UNITED STATES PATENT onnion."

"HARVEY Hermann, or nnrnenronr; comvnc'rrour.

- LOCK-GUARD non incnnnnscn'n'r LAMPSAND socxn'rs.

Specification of Letters ratent. P tented Apr. 12, 1910; Application filed December 13,1909. Serial No. 582,872.

To all'whom 'it may concern." v

Be it known that I, HARVEY HUBBELL, a citizen of the United States, Bridgeport, county of Fairfield, State of Connecticut, have invented an Improvement in Lock-Guards for Incandescent Lamps 'and Sockets, of which the following is a specification.

',This invention has for its object to pro-. vide a lock guard not only for incandescent lamps but for the sockets as well, which will prevent unauthorized removal of the lamp.

and will also prevent detachment of the socket from its cap. It is of course well understood that users of electric lamps frequently suffer serious loss through the removal of the lamps fromthe sockets and also from the removal of the s9ckets themselves fromthe socket-caps, andlfurthermore that the guards now in use are so construct-' ed that they cannot be attached or detached without removing the lamp from "the socket .or else are-divided, tliat'is made in two parts which are lunged or otherwise secured.

together. -My .present invention enables me to provide a guard of this character which shall not be dividedbut shall be integral and 'rigid,which will pass freely over the bulb of a lamp, thus avoiding thenecessity of removing the lamp from the socket in attaehin and detaching and which will not only 100 the lamp to the socket .but will lock the socket tothe cap so that neither lamp nor socket can be removed Without the use of a key.

With these and other objects in-- view I have devised the novel: lamp and socket guard of which. the-following descri tion Figure 1 is an elevation, partly .broken away, of my novel lamp and socket guard as in use; Fig. 2 an elevationof the cage detached; Fig. 3 HH'll'lYBItSd plan view of.

the cage detached: Fig. 4a plan view 'ofthe cente'ringplate; Fig. 5a cross section of the centering plate; Fig. 6 an inverted lan View of the holding plate detached; Fig. 7'

an inverted plan view of the screw; and

Fig. 8 is a plan view of thc'key, I .10 denotes a. lampsocket, 11 thesocket cap, 12 an incandescent lamp, 13 the guard residing at" tering plate. The guard proper is a'ri '31 wire cage whichmay be formed in any or. dinary or preferred manner, the essential;

proper, 14 the locking plate and 15 the cen ordinary incandescentlamp without contact with the bulb. It should be especiallynotedthat the cage is integral; that is to sa it does' not consist of independent m mbers hinged or otherwise connected to ether butis simplya rigid whole. The Ice ing plate comprises two, corresponding semi-c rcular members or parts which are indicated re spectively by 14: and 14".. At the outer periphery of the members or parts is an an 1e flange 17 having a circular grooye 18 which is "adapted to receive :the holding rin 16 of the ca or parts 1s a hole 19, half of the ole being formed in each member, which is shown as adaptedto receive the' neck 20 of a socket cap. The parts of the locking plate are ge. At the center of the mem ers' permanently but loosely connected together i them slig tly separated, as shown. in Fig. 6.

One part is provided' near its other end with a lug'or ear 22 having a threaded hole 23 and the other part is rovided opposite thereto with a U-shaped liousing 24' which inclos'es the head 25 of a screw 26 which passes through an unthreaded hole 27 in.

one side of the housing and is adaited to engage the hole in-the ear.- The hea of the screw is shown as provided with slots 28 adapted to receive corres onding projectigns 29 on the head 30 of a ll ey 31.

It will be understood. of course that any form of slots or recesso's'may be'provided'in the head of the screw and that the head of the key-must corres 0nd there'with. In use, to attach or detach time locking plat-e, thek'ey is passed through a hole 82' in the 'h'ousin which just permits the key .to passbutlwi not permit the screw to dro out. I thus make it practically impossib e for. anyone:

not possessing the'right key to loosen the locking plate and remove the cage so as to get access either to 'tlie'lamp or the socket.

. ilhe'connection of the parts'of the locking plate-by means of the pivotedfcross piece allows the parts to be swung apart when the screw is disengaged from ear 22 sufliciently to permit, the neck 20 of a socket cap to be passed through the opening should it he required to remove the locking plate and to permit the holding ring 16 01: the cage to be passed within angle flange 17 so that it will seat itself in groove 18 or tobe withdrawn therefrom. When the holding ring is seated in thegroove and the neck of a socket cap is in hole 19 in the locking plate, the cage is locked to the locking plate and the locking plate is locked to the neck of the socket cap y turning the screw into the threaded hole in car 22.

To remove the cage from the locking plate or to remove the locking plate from asocket cap it is simply necessary to turn the screw backward suiliciently to disengage it from car 22 when the parts of the lockingplate may he swung apart sulliciently to permit.

the cage to be removedfrom the locking plate and the locking plate to he removed from the socket cap if required. It will of course be'apparent that the lamp may be Q2 gthe present instance I have shown the lamp usedin any position as most convenient. In

as'projecting upward and for convenience "when used upon adesk have shown the locking plate as prr-ivided with legs 38 upon which the guard and lamp may rest, as clearly shown in Fig. 1. In the present instance I have shown ear 22 as extended to form one of the legs.

profvidedwith a flange 36 surrounding hole fgflzwhih lies in contact with the end of the f slhclret.

" in holding ring 16 of the cage and fitslooscly The centering plate 15 may or may not be used as preferred, and if usedmay or may not carry a reflector 38. The centering plate isprovided with a central hole 34 which just receives the lamp end of a socketand passes into-engagementwith the usualrib 85 on the socket; [The centering plate is shown as The centering plate just passes withithin the cage neferably being stopped hyand resting in engagement with a ring '37 of the cage. The functions of the centering igidly in place, that is preventing any .ti ihovementof the cage relatively to he lamp bulh, and also to carry a reflector if required.

, guard. ,spck 1 mp hol ding ring, a two-part locking plate havfir'ig an angle flange provided with a groove adapted to receive the holding ring and a ,60 .1;- central hole adapted to receive a lamp socket claim: h

A thus described my invention I i for incandescent lamps and rising a. r gid cage having a cap, and means for locking the parts of the locking plate together whereby the cage is secured to the locking plate, the locking plate to a socketcap and the lamp and.

socket are locked against removal.

2. A guard for incandescent lamps and V sockets comprising a rigid cage having a holding ring, a two-part locking plate having a grooved angle flange which receives the holding ring and a central hole adapted to receive a socket cap, one ot'the parts of the locking plate having an ear provided with a threaded hole and the other part having a housing, and a screw in the housing adapted to engage the hole in the ear,

for the purpose set forth.

guard for incandescent lamps and A sockets comprising a rigid cage havlng a holding ring, a. two-part locking plate hav-' ing a grooved angle flange which receives the holding ring and a central hole adapted to receive a socket cap, a cross piece pivoted to the parts of the locking plate but permitting them to be swung apart, an ear upon one of the parts having a threaded hole a housing upon the other part and a screw in the housing adapted to engage the hole in the ear. Y I

4;. The coi'nhination with an incandescent l lamp, a lamp socket having a cap and a centering plate having a hole to receive the socket, of a guard comprising a rigid cage having a holdingring within which the centering plate passes, a two-part locking plate adapted to engage the socket cap an i aving a'groove to receive the holding ring and means for securing the parts of the locking plate together.

' A. guard for incandescent lain s and sockets comprising a rigid cage, a ocking plate to which the cage is secured and which 7 to engage a lamp socket cap and is adapted plate adapted to pass withln a centering 'the cage and having a central hole to reccive the socket.

6. A guard for lncandescent lamps and sockets comprising a rigid cage, a locking plate to which the cage is secured and which is adapted to engage a lainp socket cap, a centering plate adapted to pass Within the cage and having a central'holcto receive the socket and a reflector carried by the centering plate.

7. A guard for incandescent lamps and sockets comprising a rigid cage having a holding ring, a two-part locking plate adapted to engage a lamp socket cap'and havinggroovesto receive the holding ring, a centering plate adapted to pass within the cage and having a central hole to receive the socket and means for securing the parts together and to the lamp socket cap.

8. A' guard for incandescent lamps and sockets conmrisinga rigid cage,'a two-part inching plate adapted to engasrc the cage 954,063 p i a s and a lamp socket cap and provided with having aiicentral hole to i'eeei-ve the socket 10 legs, for-the purpose set forth, and means and means for loeking'the arts in place. for locking the parts in place. In testimony whereof I a x my signature 9. A guard for incandescent lamps and in presence of two witnesses. I p -5 sockets comprisin a ri idca e a two-part locking plate ud pted to engage the eage HARVEY HUBBELL and alamp socket cap and provided with v Witnesses? legs, for the purpose set forth, a centering A. M. \VOOSTER,

plate adapted to pass within the cage and S. V. ATHERTON. 

